colorless (adj.)

• abstract
• achromatic
• achromic
• aloof
• anemic
• arid
• ashen
• ashy
• barren
• blanched
• bland
• blank
• bloodless
• blurry
• boring
• cadaverous
• characterless
• cold
• dead
• detached
• dim
• dimmed
• dingy
• disinterested
• dismal
• dispassionate
• doughy
• drab
• dreary
• dry
• dull
• dusty
• effete
• elephantine
• empty
• etiolated
• exsanguine
• faded
• faint
• fallow
• feeble
• flat
• ghastly
• gray
• haggard
• hazy
• heavy
• ho-hum
• hollow
• hueless
• impersonal
• inane
• insipid
• jejune
• lackluster
• leaden
• lifeless
• livid
• low-spirited
• lurid
• lusterless
• mat
• mealy
• muddy
• namby-pamby
• neutral
• obscure
• pale
• pale-faced
• pallid
• pasty
• pedestrian
• plodding
• pointless
• poker-faced
• poky
• ponderous
• prosaic
• prosy
• remote
• sallow
• sickly
• slow
• solemn
• spiritless
• sterile
• stiff
• stodgy
• stuffy
• superficial
• tasteless
• tedious
• toneless
• uncolored
• unimaginative
• uninspired
• uninteresting
• vacuous
• vague
• vapid
• wan
• washed-out
• waxen
• weak
• white
• wishy-washy
• withdrawn
• wooden